Table 3.

Distribution of single zone air exchange (AER_1z) and two zone air exchange (AER_2z) (1/h) by city and season

				Air exchange (AER) (1/h)
City	Season	n Homes (samples)	AER perfluorocarbon tracer Method	Mean	s.e.	5th	25th	50th	75th	95th
Edmonton	Summer	8 (49)	Single Zone	0.69	0.23	0.17	0.28	0.47	0.86	2.16
			Two Zone	0.87	0.29	0.18	0.34	0.56	1.15	2.69
	Winter	8 (37)	Single Zone	0.37	0.09	0.15	0.19	0.28	0.53	0.83
			Two Zone	0.42	0.11	0.16	0.20	0.28	0.61	1.02
Halifax	Summer	9 (60)	Single Zone	1.17	0.25	0.20	0.71	1.04	1.45	2.51
			Two Zone	1.23	0.25	0.36	0.73	1.01	1.48	2.55
	Winter	6 (33)	Single Zone	0.35	0.05	0.21	0.28	0.33	0.36	0.59
			Two Zone	0.55	0.10	0.36	0.37	0.47	0.58	1.03
Montreal	Winter	13 (108)	Single Zone	0.44	0.15	0.17	0.23	0.31	0.35	0.40
			Two Zone	0.49	0.15	0.23	0.27	0.37	0.43	0.51
All	All seasons	35 (287)	Single Zone	0.62	0.10	0.17	0.22	0.37	0.72	1.49
			Two Zone	0.70	0.11	0.18	0.27	0.45	0.97	1.83